All my passwords disappeared from my Mac.

Hello Michael Neale,

Let's start off by checking the helpful steps in this article that was linked to your posting which can help with this issue: How to find saved passwords and passkeys on your Mac - Apple Support. Follow these steps:

"View saved passwords and passkeys in System Settings

1. Choose Apple menu  > System Settings. In macOS Monterey, choose Apple menu  > System Preferences. 
2. Click Passwords.
3. Sign in with Touch ID, or enter your user account password.
4. Select a website, then click the Show Details button . In macOS Monterey, click Edit.

• To delete a password, click Delete Password
• To update a password, change it and then click Save.

View saved passwords and passkeys in Safari

1. Open Safari.
2. From the Safari menu, choose Settings (or Preferences), then click Passwords.
3. Sign in with Touch ID, or enter your user account password.
4. Select a website, then click Edit.

• To delete a password, click Delete Password.
• To update a password, change it and then click Save.

You can also use Siri to view your passwords by saying something like "Hey Siri, show my passwords."

Save your passwords across your devices with iCloud Keychain

iCloud Keychain keeps your passwords, passkeys, and other secure information updated across your iPhone, iPad, iPod touch, Mac, or PC. 

• Learn how to set up iCloud Keychain
• Set up iCloud Passwords on your PC

Learn which countries and regions support iCloud Keychain. 

Use AutoFill to store credit card information

AutoFill automatically enters things like your previously saved credit card details, contact information from the Contacts app, and more.

Learn how to set up and use AutoFill in Safari on your Mac."

Let us know if we can help with anything else at all or if this doesn't settle your issue so we can look into this further with you. Thanks and have a fabulous day!